| 摘要 |
There is described a safety helmet comprising a shell (1) and a chin-strap (2) associated thereto, the one chin-strap end (3) being rotatably mounted on a pivot (4) fastened to the shell, the other chin-strap end (7) being joined to the shell (1) through means (8) provided with a control member (9) rotatably mounted on a pivot (10) fastened to the shell (1), and so arranged as to move the chin-strap (2) between two end positions, a first position allowing either fitting the helmet on, or removing the head therefrom, wherein the chin-strap (2) projects in front of the chin to make the helmet opening completely free, and a second position corresponding to securing the helmet, wherein that chin-strap portion (12) intended to bear under the chin to secure the helmet, is bearing underneath the chin. |
